Fuel injection control device for internal combustion engine
a control device and internal combustion engine technology, applied in the direction of electric control, fuel injection apparatus, charge feed system, etc., can solve the problems of inability to perform sequential injection, different cylinder conditions of fuel carburetion, etc., and achieve stable carburetion condition
Active Publication Date: 2007-09-11
HONDA MOTOR CO LTD
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Benefits of technology
This approach improves the accuracy of fuel injection timing and reduces variation in carburetion conditions among cylinders, preventing double injection and injection failure by setting an adequate injection prohibition period, ensuring stable fuel delivery before stroke identification is complete.
Problems solved by technology
However, at the start of the internal combustion engine it is impossible to perform a sequential injection after the start of cranking until completion of the stroke identification because intake stroke timing is unknown.
For this reason, a problem exists in that the condition of fuel carburetion differs among cylinders until completion of the stroke identification.
Method used
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[0030]Next, preferred embodiments of the present invention will be described in detail referring to drawings. FIG. 1 is a schematic explanatory diagram of a 4-cycle 4-cylinder engine which is suitable for use of a fuel injection control device for an internal combustion engine according to the present invention. In #1 to #4, the first to fourth cylinders of an engine 1 are provided with intake pipes 11a to 11d connected with intake ports that are in communication with ends of narrow tubes 12a to 12d, respectively The intake pipes 11a to 11d are provided with fuel injection valves 601 to 604 which control fuel injection into each of the cylinders. A Pb (intake pressure) sensor 4 is designed to detect a combined intake pressure which combines intake pressures P1, P2, and P3 generated in the first to third intake pipes 11a to 11c by joining the other ends of the first to third narrow tubes 12a to 12c. Since the waveform of combined intake pressure Pb thus measured is apparently differe...
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A fuel injection control device for a more stable carburetion condition by setting an adequate fuel injection prohibition period at the start of an internal combustion engine. A fuel injection control device includes an injection switch which selectively switches among simultaneous injection which is performed after start of cranking in an engine until determination of a crank reference position, group injection which is performed after determination of a crank reference position until completion of stroke identification, and sequential injection which is performed after completion of stroke identification. The maximum period from simultaneous injection, after start of cranking, until simultaneously injected fuel is sucked into all cylinders #1 to #4 is set as an injection prohibition period t. The injection prohibition period t prevents “double injection,” if group injection is started just after determination of a crank reference position and “injection failure,” if the injection prohibition period is too long.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority under 35 USC 119 to Japanese Patent Application No. 2005-241567 filed on Aug. 23, 2005 the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a fuel injection control device for an internal combustion engine and more particularly to a fuel injection control device for an internal combustion engine which ensures a stable carburetion condition at the start of the engine.[0004]2. Description of Background Art[0005]A fuel injection control device in an internal combustion engine performs a sequential injection in which fuel is injected in time with each intake stroke in each cylinder, in its normal operation. However, at the start of the internal combustion engine it is impossible to perform a sequential injection after the start of cranking until completion of the stroke identification because in...
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IPC IPC(8): F02D41/06
CPCF02D41/009F02D41/062F02D2200/0406
InventorTETSUKA, TAKASHI
OwnerHONDA MOTOR CO LTD